uncapitalized-environment-variables (SIM112)

Derived from the flake8-simplify linter.

Fix is sometimes available.

What it does

Check for environment variables that are not capitalized.

Why is this bad?

By convention, environment variables should be capitalized.

On Windows, environment variables are case-insensitive and are converted to uppercase, so using lowercase environment variables can lead to subtle bugs.

Example

import os

os.environ["foo"]

Use instead:

import os

os.environ["FOO"]

References

• Python documentation: os.environ